MANUFACTURING METHOD FOR HIGH-CLEANLINESS STEEL

WIPO Patent Application WO/2021/002130

A1

Provided is a manufacturing method for a high-cleanliness steel, wherein, in continuous casting of steel, a non-oxidizing atmosphere is formed in a tundish before a molten steel is poured into the tundish to prevent reoxidation of the molten steel. The manufacturing method is characterized in that an inert gas that is heavier than air is blown toward the bottom of the tundish under conditions satisfying expressions (1) and (2). (In the expressions, ρ represents the density (kg/m3) of the inert gas; Q represents the total blow-in amount (Nm3/s) of the inert gas; μ represents the viscosity (Pa·s) of the inert gas; PTD represents the peripheral length (m) of a gas replacement region; V represents the volume (m3) of a gas blow-in region; T represents the atmospheric temperature (K) in the tundish; and tmax represents the gas blowable time (s).)　(1): 4⋅ρ⋅Q/(μ⋅PTD) ≤ 2000 (2): 3(V/Q)/(T/298) ≤ tmax

JP2001025846	METHOD AND APPARATUS FOR CONTINUOUSLY CASTING METAL
JPH02175057	AUTOMATIC CASTING APPARATUS IN CONTINUOUS CASTING
WO/1996/034713	DEVICE AND PROCESS FOR CHANGING A CONTINUOUS CASTING TUBE OF A DISTRIBUTOR IN A STEEL-WORKS

MURAI TAKESHI (JP)
MINAMI YUSUKE (JP)

PCT/JP2020/021579

January 07, 2021

June 01, 2020

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JFE STEEL CORP (JP)

B22D11/10; B22D11/106; B22D11/11; B22D11/18

WO2013190799A1

2013-12-27

JPH09300050A	1997-11-25
JP2016182612A	2016-10-20
JPS58112639A	1983-07-05

GINZA MARONIE P.C. (JP)

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